Passed the config when building the Configuration in ConfigurableExtension
merged branch stof/config_argument (PR #8359)

This PR was merged into the 2.2 branch.

Discussion
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Passed the config when building the Configuration in ConfigurableExtension

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This passes the config to ``getConfiguration`` instead of passing an empty array in ConfigurableExtension. This makes the class usable for bundle overwriting the ``getConfiguration`` method to use the config instead of using the default logic (which does not need the config).

Commits
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a830001 Passed the config when building the Configuration in ConfigurableExtension
[WebProfiler] fix content-type parameter